When you want to know "will something have weight" in terms of links, think about how easy the link is to make. If it's very easy (so as forum posts, signatures, blog comments, social bookmarking, etc) then the answer is very little to zero weight. The same goes for RSS submission. Most likely, zero weight. (Remember: Just because a link is shown in Google Webmaster Tools, it doesn't mean it is worth anything.) If a link is difficult to get, such as editorially by a popular news site (as an example), then this is going to carry a lot of weight. If you don't understand: figure out how to get people to link to you.